BookDetails.cshtml

<form asp-controller="BookDetails" asp-action="BookDetail" id="bookForm" method="post">
    @Html.AntiForgeryToken()

    <!-- all my other form controls would be somewhere in here -->

    <fieldset>
        <label asp-for="IsHardcover" class="label"></label>
        <label class="select">
            <select asp-for="IsHardcover">
                <option value="true">Yes</option>
                <option value="false">No</option>
            </select> <i></i>
        </label>
        <span asp-validation-for="IsHardcover" class="text-danger"></span>
    </fieldset>

    <fieldset>
        <label asp-for="StorageLocations" class="label"></label>
        <label class="select" >
            <select asp-for="StorageLocations">
            </select> <i></i>
        </label>
    </fieldset>

    <button id="btnSave" type="submit" class="btn btn-primary">Save</button>
</form>